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Stock-Based Compensation
9 Months Ended
Sep. 30, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
6.
Stock-Based Compensation
The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):​​​​​​​
 
 
  
Three Months Ended
September 30,
 
  
Nine Months Ended
September 30,
 
 
  
2022
 
  
2021
 
  
2022
 
  
2021
 
 
  
 
 
  
 
 
  
 
 
  
 
 
Cost of revenues
   $ 479      $ 259      $ 1,161      $ 739  
Selling, general and administrative
     1,537        1,033        4,184        2,665  
Research and development
     813        575        2,100        1,601  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 2,829      $ 1,867      $ 7,445      $ 5,005  
    
 
 
    
 
 
    
 
 
    
 
 
 
Compensation expense by type of award was as follows (in thousands):
 
 
  
Three Months Ended
September 30,
 
  
Nine Months Ended
September 30,
 
 
  
2022
 
  
2021
 
  
2022
 
  
2021
 
 
  
 
 
  
 
 
  
 
 
  
 
 
Stock options
  
$
2,531
     $ 1,661      $ 6,641      $ 4,328  
ESPP
  
 
298
       206        804        677  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
  
$
2,829
     $ 1,867      $ 7,445      $ 5,005